Lucene.NET开发——索引的合并
索引合并
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using Lucene.Net.Index;
using Lucene.Net.Store;
using Lucene.Net.Analysis.Standard;
namespace NewBeeServer
{
static class MergeIndex
{
//开始合并
public static bool BeginMerge()
{
DirectoryInfo dirInfo = new DirectoryInfo(Application.StartupPath + "\\users\\" + UserName.userName + "\\index");
FileInfo[] filesInfo = dirInfo.GetFiles();
if (filesInfo.Length ==
0)
{
CutToMain();
return true;
}
else
{
return Merge();
}
}
//合并索引
private static bool Merge()
{
DirectoryInfo from = new DirectoryInfo(Application.StartupPath + "\\users\\" + UserName.userName + "\\subindex");
DirectoryInfo to = new DirectoryInfo(Application.StartupPath + "\\users\\" + UserName.userName + "\\index");
IndexWriter indexWriter = new IndexWriter(
FSDirectory.Open(to),
new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29),
false);
indexWriter.SetMergeFactor(100000);
indexWriter.SetMaxFieldLength(int.MaxValue);
indexWriter.SetMaxBufferedDocs(int.MaxValue);
indexWriter.SetMaxMergeDocs(int.MaxValue);
try
{
FSDirectory[] fs = { FSDirectory.GetDirectory(from, false) };
indexWriter.AddIndexes(fs);
indexWriter.Optimize();
indexWriter.Close();
DeleteSubindex();
//AppendLog("已完成合并", true);
return true;
}
catch (Exception ee)
{
//AppendLog("合并索引出错", true);
return false;
MessageBox.Show(ee.Message);
}
finally
{
try
{
if (indexWriter !=
null)
indexWriter.Close();
}
catch (Exception ee)
{
}
}
}
//主索引为空，将子索引作为主索引
private static void CutToMain()
{
DirectoryInfo dirInfo = new DirectoryInfo(Application.StartupPath + "\\users\\" + UserName.userName + "\\subindex");
foreach (FileInfo fileInfo in dirInfo.GetFiles())
{
File.Move(fileInfo.FullName, Application.StartupPath + "\\users\\" + UserName.userName + "\\index\\" + fileInfo.Name);
}
}
//删除子索引
private static void DeleteSubindex()
{
//删除subindex底下的文件
DirectoryInfo dirInfo = new DirectoryInfo(Application.StartupPath + "\\users\\" + UserName.userName + "\\subindex");
foreach (FileInfo fileInfo in dirInfo.GetFiles())
{
try
{
File.Delete(fileInfo.FullName);
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
}
}
}
}
}
